Introducing SSLMate for SaaS - Get Certificates For Your Customers' Vanity Domains https://sslmate.com/blog/post/introducing_sslmate_for_saas …
Directly using LE (or any CA's API) requires doing your own key management, expiration tracking, monitoring, and challenge responses. Doable if you want, but a lot of engineering work, esp. for multi-server deployments. We have a comparison here: https://sslmate.com/saas/comparison
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